code: def setUp(self):
      self.vector = fvec(buf_size)
  
file_path: aubio/python/tests/test_zero_crossing_rate.py
imports: from numpy.testing import TestCase
  from aubio import fvec, zero_crossing_rate
label_desc: Use image node_id 1 for calling the zero_crossing_rate_test_case obj's underlying member method code with example usage: obj.setUp() without return types